"North pole, in the middle of nowhere. He seems to be using a special technique, I was barely able to detect his presence."
"Let's go finish him then."
Lucy didn't want to let such a dangerous individual alive, the very fact that he's working under 'X', who reincarnated Arthur for obviously not good intentions, makes him an existence that should be eliminated at all costs.
Instead of teleporting immediately toward the target, Arthur retrieved a luxurious looking box from his storage and passed it to Lucy while saying
"The best artifact I have ever crafted. Its name is Lonely Moon, designed to be perfectly compatible with you. Use it with care, it has an insane destructive power."
Lucy opened the box and saw the exquisite silver revolver laying inside with more than a dozen bullets of different grades and types. Arthur proceeded into explaining the significance of the bullets, their grades, and elements, how the recoil works and the fusion formation put inside.